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No. 623,287. Patented Apr. l8, I899. W. E. PARKER.

CYLINDER LUCK.

(Application filed Feb. 25, 1899.)

(No Model.)

0/5/755555 fiI/EfiL UF ZVZZZzkzwf/ ar/Ear 51% UNITED ra'rns ParentCarina 'WILLIAM E. PARKER, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THERUSSELL d: ERIVIN MANUFACTU RING COMPANY, OF SAME PLACE.

CYLINDER-LOCK.

SPECIFICATION forming part of Letters Patent No. 623,287, dated April18, 1899.

Application filed February 25, 1899. sumo. 706,808. (No model.)

To (LZZ whom it Ynuy concern:

Be it known that I, \VILLIAM E. PARKER, a citizen of the United States,residing in New Britain, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inCylinder-Locks, of which the following is a specification.

My invention relates to cylinder or pintumbler locks; and the mainobject of my improvement is to positively lock the screw which holds thecase of the cylinder-lock in its socket against rotation.

. In the accompanying drawings, Figure 1 is an elevation of my lock,showing the faceplate end. Fig. 2 is a sectional plan view of the sameon the line :0 a; of Fig. 1, and Fig. 3 is a like view on the line 11/ yof Fig. 1.

As shown, my improvement is applied to a night-latch; but the inventionrelates only to certain parts of said night-latch and is equallyapplicable to various kinds of locks, the general mechanism of which maybe of any ordinary or desired construction.

A designates the main case, having a principal face-plate l andsupplemental or finishing face-plate 5, secured upon the face of-themain face-plate by means of screws 6. The case A is provided on one sidewith a socket, into which the case or shell B of a cylinderlock isinserted and held in place by the setscrew 7. The said shell or case isthat of a well-known lock having sliding-plate tumblers, and myinvention is equally applicable to pin tumbler looks, or any lock havingJ mounted in its shell a rotary plug 12 for operating upon the partswithin the main case A, and means for locking said plug in thecylindrical case or shell B. As shown, the wall of the socket forholding said shell is beveled and the end S of the shell which is fittedthereto is dovetailed; but the particular manner of holding thecylinder-lock in its socket is not material, provided it is held by ascrew the head of which extends through the face-plate. Neither is itessential that the holding-screw shall be a longitudinallymoving screw,as it is common in this class of locks to employa screw that is heldagainst longitudinal movement while being turned to force a shoe orslide against the cylinderlock shell for securing the same in place.

is also immaterial whether there is only one cylinder-lock, as shown, ortwo cylinder-locks, one on each side of the main case, or whether thereare one or two holding-screws in the face-plate.

The screw-holes and the screws by which the lock maybe fastened to thedoor are covered up by the supplemental face-plate 5. Asupplementahface-plate thus covering up screws in the main face-plate isold and not of itself claimed as my invention.

In order to lock the set-screw or holdingscrew 7 against rotation toprevent tampering or accidental unfastening, I provide the outer end ofsaid screw with an angular or equivalent shaped head 9, and I form acorrespondingly-shaped hole 10 in the finishing face-plate, whereby saidface-plate cannot be put on until the screw is turned to bring itsangular head into a position to register with the angular hole in theface-plate, and when the said face-plate is on the screw cannot berotated at all. The screw is, however, capable of being turned in theordinary manner for inserting and removing the cylinder-lock when thesupplemental face-plate is removed. After the screw has been turned intoits position for holding the cylinder-lock in place if the position ofthe angular head does not register with the angular hole in thefaceplate, the screw can be turned either backward or forward to make itregister therewith, care being taken to have the screw set uptightenough to firmly hold the shell. Even when screwed up tightly enough tohold the shell it can be forced in a little farther without doing anyharm. a

I claim as my invention The combination of a lock-case, a cylindergolook mounted therein, with the shell-holding screw having an angularhead, and the supplemental face-plate secured upon the main face-plateof said case and having an angular hole that receives the head of saidholdingscrew, whereby said screw is locked against rotation,substantially as described.

WILLIAM E. PARKER.

IVitnesses:

M. S. WIARD, ISAAC D. RUssELL.

